Hepatitis A is transmitted mainly through the fecal-oral route. The virus excreted in feces is transmitted orally through contaminated hands, water and food, and can lead to epidemics or outbreaks, as well as sporadic illnesses caused by daily contact. Hepatitis B is transmitted by blood, mother-to-child transmission, unprotected sexual contact, and close daily contact, such as sharing toothbrushes and razors. The transmission route of hepatitis C is similar to that of hepatitis B. It can be transmitted through blood, mother-to-child and sexual contact. Hepatitis D is mainly transmitted through blood transfusion and blood products, and can be transmitted from mother to child if positive for E antigen and hepatitis D antibodies. The transmission route of hepatitis E is similar to that of hepatitis A. It is mainly transmitted through the fecal-oral route, but can also be transmitted through daily contact.